Improvement in steam-pumps



" rnn STATES PATENT Crimen JOHN OAHILL, OF MAHANOY CITY, PENNSYLVANIA.

IMPROVEMENT IN STEAM-PUMPS.

Specication forming part of Letters Patent No. l S l ,408, dated August22, 1876; application tiled,

- May io, 1876.

To all whom it may concern:

Be it known that I, JOHN CAHILL, of Mahanoy City, in the county ofSchuylkill and State of Pennsylvania, have invented certain new anduseful Improvements in Pumps 5 and I do hereby declare that thefollowing is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, and to the letters of referencemarked thereon, which form part of this specification.

- The nature of my invention consists in the construction of asteam-pump, as will be hereinafter more fully set forth.

In order to enable others skilled in the ar to which my inventionappertains to make and use the same, I will now proceed to describe itsconstruction and operation, referring to the annexed drawings, in which-Figure l is a plan view, and Fig. 2 a side elevation, of my invention.

' A represents an ordinary cylinder with piston and piston-rodB. Thecylinder is provided with two steam-chests, O C, each with aslide-valve, D, to control the steam on both ends ofthe cylinder. Theseslide-valves have but two openings, so that when the' steam is shut oft'it exhausts at the same time. Over the steam-chests are two stop-valves,E E, to regulate steam for each valve separately. The slide-valves D Dare, by rods a a, connected to arms b b, extending downward from twoparallel rocking shafts, d d, which are provided with two uprightlevers, G Gr, used for starting-bars. From the rock-shafts d d dependcurved arms ff, which are operated alternately by a tappet, h, on theside of a tappet-rod, H, sliding in bearings alongside of the cylinder.I I represent an air or water cataract, used for opening theslide-valves, the 4plungers thereof being, by rods 7a k, connected witharms m in, extending outward in opposite directions from the rock-shaftsd d. The cataract feeds itself' from the check-valve J, and a check andscrew valve, K, is used for discharging air. At each end of thetappetrod H is a projection, n, which stops the pumps in case anythingshould go wrong, by coming under the bent ends of the arms m. Thetappet-rod H is connected -to an elbowlever, L, and the other arm ofthis lever is connected to a pivoted rocking arm, P, under thepiston-rod, whereby the stroke is regulated. 'Ihe piston-rod B of theengine is, in operation, attached to the plunger of the pump by acoupling, R, on the end of the piston i rod. Ateach end of the pivotedrocking arm P there is an adjustable tappet, P', to regulate the stroke.Now, as the piston-rod moves out the coupling R will strike thetappet'P'on the beam P, and bear it down, raising the other end, whereby theplugrod H will be moved in its bearings, and the tappet h thereon strikethe curved arm f, and, through the connections described, close theslide-valve D, through which steam was entering, and exhaust. It willthen stand still until the cataract forces the air out of the screw orcheck valve K, which can be regulated so as to let it out fast or slow.

The pump may be started in a few seconds by opening this valve all theway, or it can be made to stand any length of time by partly closing thevalve, so as to let the air out gradually, and by that means the pumpmay be run so as to have no hard knocks at either e'nd. A

The cataract sucks the air in through the check valve J when the plungeris lifted. The projections n on the plug-rod H will be made 'adjustablethereon by set-screws, and set so that as long as the pump is runningall right the bent ends of the arms m will just clear them 5 but as soonas anything gets wrong, causing the engine to run the least bit too far,one of said projections n will come under the corresponding arm m, sothat the slide-valve cannot open until relieved by hand.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, isi 1. In a steam-pump, thecombination, with the cylinder A, of the two steam-chests C C, withslide-valves D D and the stop-valves E E, substantially as and for thepurposes herein set forth. f

2. The combination of the slide-,valves D D, rods a a, rocking shafts dd, with arms b b and ff, and the sliding `tappet-rod H, with the tappeth, substantially as and for the purposes herein set forth.

3. The combination of the plug-rod H, elbow- 2 y Y nimes4 lever L,andthe pivoted rocking `arm P, with rodl H, operting in combination withthe bent t adjustable tappets P', operated by the piston# rod B, ars andfor the purposes herein set forth. O

4. The combination ofthe cataract I I,with valves J K, plunger-rods lalc, and arms m m on the rocking shafts d d, connected with theslide-valves D D, as and for the `purposes herein set forth.

5. The projections n n on the sliding tappet-` ends of the armsmrm andthe cataract, as and for the purposes herein set forth.`

vI11testimony that I clairn the foregoing as my own I afx `my signaturein presence of two withesses,Y i t i JOHN UAHILL, i Witnesses: ELIREEsE-,

BERNARD OOLLIGAN.

